End-of-Train Device (ETD)
An ETD is the FRA-mandated unit on the trailing car that monitors brake-pipe pressure and transmits status to the locomotive cab.
An End-of-Train Device (ETD) — historically called an EOT or FRED — is the federally mandated electronic unit mounted on the coupler of the last car in a freight consist. It replaces the manned caboose by continuously measuring brake-pipe pressure at the rear of the train and transmitting that reading, along with motion and marker-light status, to a Head-of-Train (HOT) display in the locomotive cab over a dedicated 457 MHz radio link. Two-way ETDs add emergency-brake initiation from the rear, a requirement on most heavy-grade and long-train territory. The ETD is the single point of truth for what is actually happening at the back of the train; without it, the engineer has no visibility into trailing-car brake response, separation, or motion. Modern installations increasingly pair the ETD with a rear-facing LTE camera so the crew can see the rear, not just read its pressure.
The ETD is a safety-critical and FRA-regulated device — 49 CFR Part 232 governs its operation, testing, and air-brake performance requirements. A failed or miscommunicating ETD takes a train out of service. But even a working ETD only tells the engineer a number; it cannot show a fouled crossing, a trespasser on the right-of-way, a separated car, or a vehicle striking the rear during a shove move. That visibility gap is why modern operators pair ETDs with rear-facing camera coverage from RAILvue's end-of-train visibility systems, which mounts a magnetic LTE camera on the trailing car and streams live video to the cab over cellular. Pressure data plus video closes the loop.
When you arrive on duty, the brake test starts at the ETD: you confirm marker light, motion, and that the rear pressure matches the head-end gauge within the allowable tolerance. On a 10,000-foot grain train climbing into the Rockies, the ETD is what tells you the rear-end set-and-release is responding correctly two miles behind you. On a push-pull move into a stub yard, the ETD radio is your only line of communication with the trailing equipment — until you add a rear camera. The day you have one, you stop wondering what's behind you and start seeing it.
Solutions
- End-of-Train Visibility Systems
Direct fit: adds live rear video to the ETD's pressure data.
- Locomotive Camera Systems
The cab-side counterpart; ETD status displays alongside forward and interior video on the same in-cab monitor.
- Rail Yard & Siding Security Systems
Yard staging of ETD-equipped consists; documents tampering and theft of the rear-end unit.
- Train Consist
A train consist is the complete ordered inventory of locomotives and cars that make up a train, used for crew briefing, air brake testing, and operational planning.
- Distributed Power Unit (DPU)
A DPU is a locomotive cut into the middle or rear of a long freight train and controlled remotely from the lead unit to distribute tractive and braking effort along the consist.
- Event Recorder
An event recorder is the FRA-mandated onboard data logger that continuously captures locomotive operating parameters — speed, throttle, brake applications, and signal status — for post-incident analysis.
- Locomotive
A locomotive is the self-propelled power unit that generates tractive effort to move a train consist over a railroad.
- Dynamic Braking
Dynamic braking is a braking mode in which a locomotive's traction motors are switched to act as generators, converting kinetic energy into electrical resistance and providing controlled retardation without applying the air brake system.
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